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4(2l+5)=84
We move all terms to the left:
4(2l+5)-(84)=0
We multiply parentheses
8l+20-84=0
We add all the numbers together, and all the variables
8l-64=0
We move all terms containing l to the left, all other terms to the right
8l=64
l=64/8
l=8
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